M&S says

For the sartorially savvy, a waistcoat is an excellent way to give a simple twist to a classic look and mix up your wardrobe. The buttons are fused on with Buttonsafe™ technology, to keep them secure even with regular laundering. This waistcoat for men comes in a tailored fit, keeping you looking trim and suave. The slick black front is contrasted by the lighter sheen back, giving it the versatility to be paired with all kinds of shirts and trouser combinations.

Style

Care and Composition

35 days to return
You may return or exchange unused products within 35 days of purchase with a valid parcel summary document. Your items don't need to be in the original box or bag as long as they're securely packaged.

How to return
Simply use our returns portal to print a returns label and returns note. You will then be able to return all or part of your order at your own cost through your preferred carrier. To create a returns label, visit our returns portal select this option and follow the instructions.